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Detection rules › Sigma

SonicWall SSL/VPN Jarrewrite Exploitation

Status
test
Severity
high
Log source
category webserver
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects exploitation attempts of the SonicWall Jarrewrite Exploit

MITRE ATT&CK coverage

TacticTechniques
Initial Access

Rule body

title: SonicWall SSL/VPN Jarrewrite Exploitation
id: 6f55f047-112b-4101-ad32-43913f52db46
status: test
description: Detects exploitation attempts of the SonicWall Jarrewrite Exploit
references:
    - https://web.archive.org/web/20210126045316/https://darrenmartyn.ie/2021/01/24/visualdoor-sonicwall-ssl-vpn-exploit/
    - https://github.com/darrenmartyn/VisualDoor
author: Florian Roth (Nextron Systems)
date: 2021-01-25
modified: 2023-04-27
tags:
    - attack.t1190
    - attack.initial-access
    - detection.emerging-threats
logsource:
    category: webserver
detection:
    selection:
        cs-uri-query|contains: '/cgi-bin/jarrewrite.sh'
        cs-user-agent|contains:
            - ':;'
            - '() {'
            - '/bin/bash -c'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    cs-uri-query|contains: '/cgi-bin/jarrewrite.sh'
    cs-user-agent|contains:
        - ':;'
        - '() {'
        - '/bin/bash -c'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
cs-uri-querymatch
  • /cgi-bin/jarrewrite.sh
field:"cs-uri-query" kind:match value:"/cgi-bin/jarrewrite.sh"
cs-user-agentmatch
  • () {
  • /bin/bash -c
  • :;
field:"cs-user-agent" kind:match